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Study on Cutting Tool Selection for High Efficiency NC Machining of Complex Pocket

Author: YinZhenZuo
Tutor: LiuFei
School: Chongqing University
Course: Mechanical Manufacturing and Automation
Keywords: Cavity CNC machining Efficient Tool material Tool sequence
CLC: TG659
Type: PhD thesis
Year: 2011
Downloads: 194
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Abstract

The cavity workpiece in modern industrial production involves a very wide range of structural components the mold core component of the system widely used such as related to the automotive, appliance, machine tools and other manufacturing industries, aerospace, marine engineering and high-end equipment cabin, as well as complex metal crafts concave surfaces. Cavity workpiece usually complex shape, species diversity, resulting in complex CNC machining process, easy processing efficiency is not high, the quality is difficult to guarantee the actual problem. The cavity machining facing short-duration, high-quality, low-cost urgent need. Therefore, efficient CNC machining of the mold cavity is a solved problem. The tool preferably is one of the key elements of the cavity efficient CNC machining, has an important role to improve the cavity machining efficiency and quality, and reduce costs. This article is for efficient CNC machining of the mold cavity, the tool preferred technology research, the main content is as follows: analysis of cavity CNC machining characteristics required of the tool, a clear cavity contains the main content of CNC machining tool preferred to build a contains the target layer, the the tool preferred technology framework to optimize function layer, technical support and data layers, and on this basis to explain the process and key technologies preferred tool in this article. On the basis of analysis of the processing goals, workpiece, machine tool and process factors influence the decision-making process of the tool material proposed a tool for complex cutting live material decision-making method. The method to design and build a number corresponding with the commonly used processing target and contain the tool material performance indicators to be investigated and their initial weights template for the decision choices; workpiece to establish the characteristics of the workpiece, machine tool and process system for the extraction of the actual processing of the case, the machine exporting artifacts and the specific characteristics of the process; knowledge reasoning method, the characteristics of the machine tool and process constraints and the focus on the performance of the tool material, and the constraints are used to screen out qualified tool materials, will focus on the user selected template used to correct the weight of tool material performance; based on indicators of performance template and correction re-established tool material evaluation model, the evaluation and selection of the best qualified tool material. The Application Case said the feasibility and practicality of the method. The tool diameter and tool pocket machining is preferably a combination of process, it is determined whether the processing domain can be split with the basis of significance. To this end, the domain is separable discriminant cavity machining concepts and methods - the cavity milling purely District proposed for its discrimination method. First proposed concept of milling simplex zone, given its definition, milling pure area is a class if and only if the use of a tool can achieve optimal processing of the special area, and has no longer stars, completely covers and effectiveness optimality these three characteristics. Then given and to demonstrate milling pure District Criterion, to establish a the Milling simple discriminant model from the point of view of the processing costs, and designed on the basis of the Milling simple discriminant algorithm. The numerical results prove the theoretical and practical value of the proposed concepts and methods. Proposes a support cavity roughing tool sequence efficient screening method optimization tool. Incremental benefits generated the the contrast cutter combination process due to the complementary strengths of the different tools and the the benefits associated loss due to ATC, to establish an effective analytical model used to determine whether the tool sequence; on this basis, from The angle of the tool sequence combination of form to construct and prove partial redundancy tool one can distinguish rules, and the rules and constraints based on geometry, equipment and processes tool screening methods series, get a good tool selection effect. Numerical results show that the proposed method in effect removing partially redundant tool. Presents a the improved cavity roughing feasible tool sequence construction method. Based on feasible tool sequence construction method of the present analysis, pointed out that to approximate pure mathematical permutations of the tool so that the solution space is too large, thereby restricting the tool sequence optimization efficiency is the main shortcomings of the method; through the tool sequence the validity of the analysis, we found a viable tool sequence build process tool between mutually exclusive characteristics, and the characteristics of the introduction to the current construction method being viable tool sequence, the solution space constraints, most invalid sequence The pre-excluded. Numerical results show that the improved method can obviously rule out most of the invalid tool sequence, efficient optimization tool sequence has a good supporting role.

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